body{
    position: relative;
    header{
        height: 50px;
        .iconfont {
            font-size: 30px;
            width: 50px;
            height: 50px;
        }
    }
    main {
        flex: 1;

        overflow: scroll;
        /* 超出显示滚动条 */
       video{
       margin-top: 50px;
        left: 0;
        top: 25%;
    
       }
       
    
        
    }
    .play{
        position: fixed;
        bottom: 0;
        left: 0;
        height: 80px;
        width: 100%;
        padding: 5%;
        z-index: 2;
        .iconfont {
            font-size: 50px;
            width: 50px;
            height: 50px;
        }
       }
}
